Boost the SPI bus clock frequency from 50MHz to 75MHz in the bootblock early initialization. This increase reduces the latency for loading subsequent stages (romstage/ramstage) from the SPI flash. Since the QSPI core can now be configured to 300MHz, this 75MHz bus speed maintains a stable 1:4 integer divider ratio, ensuring optimal signal integrity and timing margins for the flash interface. BUG=b:478226455 TEST=Verified successful boot on Bluey. Observed a reduction (10ms) in 'read SPI' duration in the console logs and confirmed that the vboot hash verification passes consistently. Change-Id: Idea0dbdd435cbbfe22a756d2b94b1cdfa3c70ffe Signed-off-by: Subrata Banik <subratabanik@google.com> Reviewed-on: https://review.coreboot.org/c/coreboot/+/90887 Tested-by: build bot (Jenkins) <no-reply@coreboot.org> Reviewed-by: Paul Menzel <paulepanter@mailbox.org> Reviewed-by: Kapil Porwal <kapilporwal@google.com> Reviewed-by: Derek Huang <derekhuang@google.com> |
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